Locking-chuck for rock-drills, &amp;c.



S. W. BROTHERS.

LOCKING CHUCK POE ROCK DEILLS, 6w. APPLICATION FILED FEB.24,1913.

1,75,325 Patented Oct. 14, 1913.

2 SHEETS-SHEET 2.

WITNESSES: IAVVEVTOR.

I SANFORD W.BROTHERS A fro/M 5116 S. W. BROTHERS.

LOCKING CHUCK FOR ROCK DRILLS, m.

APPLICATION FILED FEB. 24,1913.

Patented Oct. 14, 1913.

Z SHEETS-SHEET l.

INVENTOR.

SANFORD W.BROTHERS.

-@ AT'I'OANEVJ IV/TNESSES:

' swmeamaoareea r eaa Fahemtgedflot. 2M1, 191.3.

AppficationfledFe-bruary 2%, 1913. Serial No. 750,278.

To allwiiom timely-concern:

Be it known that I, SANFORD W. BROTH- ERS, a citizen of. theUnitedStates, and resident of Denver, in the county of Denver and Stateof Colorado, have; invented certain new and useful Improvements inLooking-Chucks for Rock-Drills, &c.; andI dohereby declare the followingto be a full;

clear, and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification, and' to thefigures and letters of reference marked thereon.

Ilhis invention relates to chucks particularly designed for use with,power driven rockdrills in which a hammer blow isdelivered on the end ofthe drill bit held in the chuck. I i

Ihe objects of the invention are to. provide aisim le chuck. composed offew parts and of $116 character as to successfully resi'st the strainsto which the chuck is subjected in the run hv use for which.instrumentsof this kin are designed and at the same time provide for thequick and easy removal of the drill and the insertion of a A furtherobject of the invention is to provide a drill chuck with which the drillis given a freedom for rebound and with which injurious results due toan overstroke or new drill as required.

blow of the hammer onv the front headwill. be overcome or neutralized insuch wise; as to prevent injury .to the machine, or the chuck members.

Referring to the accompanying drawings,Figure 1 is a sectional elevationof the front end of a. drill embodying a, chuck constructed inaccordance. with the resent invention, the parts in section being okenaway on irregular lines, whereby the contour, as well as the internalconstruction, is shown. Fig. 2 is an end elevation ofthe outer chuck andhead members shown in Fig; 1, with parts in" section, and the drillmounted therein in unlocked position. Fig. 3'is a similar View with thedrill in locked posrti'on. Fig. {i is a sectional elevation of the chuckand outer head members, showing the osition of'the chuck members whenthedril is locked therein. Fig. 5 is'a similar theunlocked to the lockedposition.

shown with the locking member ofthe chuck in, an intermediate position.-Fig. 6 is a perspective view of the outer. or locking member of thechuck. Fig. 7--'isa, perspec tive View of a. portion of'tlie sleeve orinner drill head receiving chuck member. Fig; 8 isan end elevationof'thechuck member shown in Fig.- 6 with awrench: in position for,-turning the same into locked. or 1111- locked:- position;

Similar reference numbers in the; several views-indicate the same parts;

In illustrating the present invention it has been thought-necessarytoshow-only the front end of a rock drillcylinder, it being understoodthat the cylinder and parts-for operatin "the piston hammer therein areof any 0 inary" or preferred construction adapted to deliver a'successiongof blows on the head or inner end of the drill bit indi+cat-edat- 9. The lowerend of the cylinder is indicated at 15- and it isadapted to re; ceive the piston, the nose or hammerend of which isindicated at 19 in the drawings. In thepart-icul'arconstructionillustrated the cylinder is provided with lateral lugs 17 through whichrods 16 pass for holding the parts together; thus the said rods 1-6 areadapted to receive the transverse ears or lugs of the inner-head 1-8 andto retain the same in. position on the cylinder with a yieldingpressure. For this purpose the head 18" is adapted to slidelongitudinally on the rods 16, but is normally held inthe positionshownin Fig. 1' by coil springs 19 surrounding the rods in front of thelugs on the headand adapted to be adjusted by adjusting and lock nuts 20and 21, respectively, threaded-on therods infront of the Springs. InView of the'well known con s-truction-of dri'l-ls' of thistype it isthought unnecessary to show theentiredrill,- but simply so much as topresent the pmper' application of the improvement herein described, itbeing understood. that thelongitudinal rods '16 are carried through-lugslocated at the upper end of thedrill casing'anfd secured thereto,holding the lower c k members in normal position, as shown In g huntedonthe front endof the head member 18 is anoversleeve (Jr-outer headmember 13 also having: lugs 25 through,

longitudinal movement on the rods and member 18 for a purpose which willbepresently shown. The over-sleeve or outer head 13 is held inwardlywith a yielding pressure by coil springs 22 surrounding the rods andadapted to be adjusted and held in ad usted position by adjusting andlock nuts 23 and 24, respectively. I

Within the head member 18 there is mounted, so as to be capable ofrotation, an

inner chuck member 11, which, at its rear end, is adapted to receive thenose 12 of the piston hammer and at its forward end to 'receive the heador end of the drill, and

through which rotary motion is imparted to the drill. Ordinary means maybe employed for rotating the inner chuck member intermittently, and asshown said member is provided with an internal sleeve 14 preferably.threaded into the same from the rear end anditself having internalgrooves for cooperating with ribs on the nose of the piston hammer -12.With this arrangement ro- Itation imparted to the piston hammer will becommunicated to the inner chuck membera'nd at the same time the pistonhammer will be left free to reciprocate independently and to deliversuccessive blows upon the inner end of the drill.

For-holding the drill in place with the 1 greatest possible security andat the same time permitting of its ready removal and re-..

placement when occasion demands, an outer chuck member 10 is mounted inline with the inner chuck member 11 and adapted to be held between theouter head 13 and-the innor head 18, as. will be readily understood froman inspection of Figs. 1, 4 and 5. The aperture through the outer chuckmember 10 is shaped to. correspond to the transverse contour of thedrill shank and lugs 9*, whereby when the outer chuck member ispositioned with the transverse enlargements registering with the ends ofthe enlarge -ments orv slots .11, the drill head maybe readily insertedor removed, but if said outer chuck member be given a quarter turn, soas to bring transverse enlargements of its aperture out of registry withthe slots 11 the lugs 10 Will be retained within the slots '11 and thedrill will consequently be retained in the ,chuck. Conveniently, theouter chuck member is held in its proper relation to the inner chuckmember by locking pro j ections 10 which are adapted to enter either thelower ends of the slots or enlargements 11 or the recesses 11 in thelower end of The recesses 11 and slots 11 are offset angularly 90 withthe inner chuck member.

relation to each other, and consequently a quarter turn-of the outerchuck member in I one direction or the other ,will bring theenlargements of its aperture into-line with the 1 slots 11 or at rightangles thereto, as the case may be, so as to lock or release the drillas desired. The springs 22 serve to hold the outer chuck member inwardlywith a yielding pressure, whereby the locking projections 10 will beretained in said recesses or slots and as a convenient means whereby thesaid outer chuck member may be rotated for looking or releasing the'drill, its forwardly projecting nose piece or end 10 is shaped for theapplication of a wrench or turning instrument such as indicated at 26 jin Fig. 8.

The operation of the device will be readily I understood from thedrawings, wherein Fig.

2- shows the outer chuck member in the position occupied by it when thedrill is being inserted, while Fig. 3 shows the same parts after thedrill is inserted and the outer chuck member has been given a quarterturn. Fig.

4 shows the position of the parts with the outer chuck member in lockedposition, as in Fig. 3, and Fig. 5 showsthe position assumed'by theparts when the outer chuck member has been drawn forwardly by thepassage of the locking lugs 1O out of the slots or recesses and duringtheir transit from one position to the other.

Owing to the fact that the outer or looking chuck member is locked tothe inner rotary chuck member, the two members partake of the samerotary. motion during the operation of the drill and consequently thereis little or no danger of the parts becoming relatively displaced so .asto release the drill and there is .no liability of any of the partsbecoming jammed or sticking so as to interfere with their ready andsuccessful operation either as a chuck which may be locked or unlockedat will, or as parts of the drill mechanism, whereby the drill isloosely held for the direct impact of the hammer and rotatedintermittently in accordance with approved practice.

-Having thus described my invention, what I claim and desire to secureby Letters Pat ent of the United States is:

1. In a locking chuck for drills, etc., the" combination with thecylinder, inner and outer heads, yieldingly supported in relation toeach other and in relation to said cylinder,

of inner and outer chuck members having.

.alined passages therein for the drill shank and transverse enlargementsof said passages for the reception of lugson the drill shank, and meanswhereby the inner and rotatably'mounted between the ends of the innerand outer head members and having a drill shank opening therein withtransverse enlargements adapted to aline with the transverseenlargements in the inner chuck member, and cooperating lugs andrecesses on the proximate faces of the chuck members whereby theyarelocked in proper relative positions to lock and retain the drill orrelease the same.

3; In a chuck mechanism for rockdrills,

the combination. with the cylinder, a head yieldingly supported in theend of said cyl-/ inder and a supplemental head yieldingly supported onthe first mentioned head, of an inner chuck member rotatably mountedwithin the head and having a drill shank socket.

- extending therethrough said socket having transverse enlargements-forthe reception of lugs on the drill, and an outer chuck mem-,

her having an opening therethrough for the drill shank, with transverseenlargements for the passage of said lugs, said outer chuck member beingheld between the outer ends of the two heads and'projectingbeyond thesame for the apfilicatlon of a wrench, and lugs and recesses on theproximate faces of the inner and outer chuck members for holding saidmembers in definite angularrelation to each other for locking orreleasing the drill.

' outer head members slidably mounted longitudinally with relation-toeach other, clamp- 4. In a chuck mechanism for rock drills, the.COIIlblllEttlOIbWlth a cylinder, inner and inorods and springs foryieldingly retaining said head members independently of each other, ofinner, and outer chuck menribers rotatably mounted in the inner andouter head members respectively, said chuck sa-ges therethrough for thereception of the drill head, i

said passages having transverse enlargements for the reception of lugskm the drill head, and the proximate faces of the chuck members beinprovided with locking lugs and recesses tbr retaining the chuck membersin proper angular relation to each other for locking or releasing thedrill.

5. In a chuck for rock bination with longitudinally yieldinginner .andouter head members, and inner and outer chuck members rotatably mountedin said inner and outer head members and eml bod ing means whereby thedrill may be hel or releasedby relative angularmovement of the chuckmembers, of clamping rods having reduced end portions, and

sprlngs and adjusting nuts for the inner head member mounted on theportion of the rod of larger diameter, and springs and adjusting nutsfor the outer head j member mounted on. the portions of" the rod of thesmaller diameter. 1 v

6. In achuck for rock drills, the combination with the cylinder, aheadmovable toward and from the c linder, clamping rods and spring foryieldmgly holding said head in position on the cylinder, memberrotatably mounted in said head, and means carried by said chuck memberfor rotating the drill in unison therewithgand independently of thehead. I

7. In a rock drill, the combination with yieldingly supported inner andouter head members, a locking chuck member held between the outer endsofsaidhead members and free to rotate with relation thereto, said chuckmember having a projecting end shaped for the reception of a turnlngwrench, of an inner chuck member rotatably mounted in the inner headmember, said chuck' members having alined apertures a drill head, andformed.

i the outer-chuck member being provided with to enter the transverseapertures of the lnner locking lugsadapted enlargements of the chuckmember.- I

SANFORD W, BROTHERS. Witnesses:

J. A. WALKER,

Gounonn.

drills, the com of a chuck

